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PUBLISHED MAY 27, 1969 776 311 METHOD OF PREVENTING REARRANGEMENT 0FBLOCKED COPOLYESTERS James G. Smith, Charles J. Klbler, and Roger M.Schulken, In, all of L0. B0: 511, Kingspcrt, Tenn. 37662 Continuation ofapplication Ser. No. 678,457, Oct. 26, 1967. This application Nov. 13,1968. Published May 27, 1969 Int. Cl. (308g 17/06, 51/56 US. Cl. 260-755 Sheets Drawing. 36 Pages Specification Block copolyesters preparedfrom (A) at least one glycol and (B) at least one dibasic acidcomprising at least 60 mole percent of an acid having two carboxylradicals attached to a carbocyclic nucleus having from 6-20 carbons perring, in which copolyesters at least three components are present, oneof which can be pres ent as an isomer of one of the other twocomponents, said copolyester if one of the fiberand film-forming type,having a number average molecular weight between about 8,000 to about100,000, are treated in the powdered form with steam at a hightemperature from the range of from about 100 C. to about 200 C. for aperiod ranging from 34 hour to 20 hours whereby the block-type structureis stabilized. In the alternative such'bloclr oopolyesters are treatedwith from about 0.005 to 0.5% by weight of an arsenic compound, e.g.arsenic pentoxide. Either alternathe method results in a blockoopolyester having a stabiliz'ed form which resists randomizationprobably because the catalyst has been converted into an inactive form.

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SN 776311 May 27, 1969 J. G. SMITH ETAL DEF. Pua.

mmnou OF PREVENTING REARRANGEMENT 0F BLOCKED corowss'mns Filed Nov. 13,1968 Sheet J of 5 FJ.9"1 a J PRECIPITANT RECORDER4 LIGHT 6 SOURCE LTsM'Ff mcmENrO' PHOTO BEAM BEAM CELL -31- o g I PRECIPITATION CURVE 0TYPICAL FIBER-FORMING COPOLYESTER PRECIPITATED FROM 60-40PHENOL-TETRACHLORETHANE WITH METHANOL 10o 2 9O 8 so 52 70 2 6 a) o z 50E 40 '2 30 20 m I OF PRECIPITANT Figz2 James G Smith Charles J KiblerR0gerM.Schulken,Jn

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May 27, 1969 J. 6. SMITH ETAL METHOD OF PREVENTING HEARRANGEMENT 0FBLOCKED COPOLYESTERS Filed Nov. 13, 1968 Sheet ,1 of 6 O I n o O? m MN OU 0-2-00: w 0-04 uj tqrmmmwk zoIo U 20 53 :0 53m 93 3:82 6 53mm 502 m wh. m w 5 om m2; u

James Snail-h Charles J. Kibler RogerM.Scludlren,Jn

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May 27, 1969 J. a. SMITH s'rm.

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